smart card emulator

Abstract

The invention discloses a smart card simulator, which comprises a simulation chip, a management module, a SRAM (Static Random Access Memory) memory and a power module, wherein the simulation module carries out a read-write operation on the SRAM memory through a standard data / address bus; when cold reset happens, the management module controls the simulation module to enter or quit a reset state through a control signal, and controls the power module to stop or recover power supply to the SRAM memory through the control signal; and the SRAM memory equivalently simulates an XRAM (On-Chip Expanded RAM) in the chip. The smart card simulator can equivalently realize cold reset, and guarantees that the integral function and performance of the smart card simulator can be consistent with the integral function and performance of a practical chip.

Description

technical field [0001] The invention relates to the field of emulators, in particular to a smart card emulator. Background technique [0002] There is a user program developed by the user in the processor chip. In the writing and debugging of the user program, the tool used is generally a processor chip emulator. The emulator uses an emulation chip containing various functions of the product processor chip to simulate the working behavior of the product chip processor, emulation chip and other parts of the emulator (program memory for storing user programs, data memory for storing data, and user The integrated development environment on the computer, etc.) cooperates to realize the simulation operation of the user program and various debugging functions. [0003] SRAM (Static Random Access Memory, static random access memory) is usually used in the emulator to equivalently replace the XRAM (on-chip expanded Random Access Memory, on-chip expanded static random access memory)...

AI Technical Summary

Problems solved by technology

However, because the card reader cannot provide enough power consumption, the smart card emulator is powered by its own independent power supply, so because there is no real power-off and power-on process, but a reset, the smart card emulator The content of XRAM will not change, and it is still the same as the data before the card reader initiates a power failure, which causes the function of the emulator to be inconsistent with the actual chip, affecting the development and use of user code

If the emulator component modifies all data in the XRAM area of ​​the emulator to random values ​​after the card reader initiates a power-off, although the function can be consistent with the actual chip, but because the XRAM capacity is getting larger and larger, this modification process The difference between the emulator and the chip caused by time consumption cannot be ignored and is getting bigger and bigger, so this method is not advisable

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